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y in (-oo:+oo)
y/4.3 = 5.7/6.9 // - 5.7/6.9
y/4.3-(5.7/6.9) = 0
y/4.3-0.82608696 = 0
0.23255814*y-0.82608696 = 0 // + 0.82608696
0.23255814*y = 0.82608696 // : 0.23255814
y = 0.82608696/0.23255814
y = 3.55217392
y = 3.55217392
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